Tool-holding attachment for lathes



(No Model.)

W. PREOH.

TOOL HOLDING ATTACHMENT FOR LATHES.

Patented Nov. 3, 1885.

2 Sheets-Sheet 1.

MM Join/k 2 SheetsSheet 2.

W. FREOH.

TOOL HOLDING ATTACHMENT FOR LATHES. No. 329,447.

(No Model.)

Patented Nov. 3, 1885.

N. PETERS. Pholo-Lilhographor. WashiugiomDC.

UNITED STATES PATENT OFFICE.

WILLIAM FREGH, OF CHICAGO, ILLINOIS.

TOOL-HOLDING ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 329,447, dated November3, 1885.

Application tiled July 30,1884. Serial No. 139,192.

To all whom it may concern.-

Be it known that I, WILLIAM FREOH, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Automatic VerticalTurret-Heads for Lathes, of which the following is a specification, towit:

This invention relates to an improvement in automatic verticalturret-heads for lathes; and it consists in certain peculiarities of theconstruction and arrangement of the head and its operating mechanism,substantially as will be hereinafter more fully set forth and claimed.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the accompanying drawings, inwhich Figure l is a perspective view of a lathe having my inventionattached to its tail-stock, the tail-stock as ordinarily used beingshown detached in the same figure; Fig. 2, a plan View of theturret-head and tail-stock; Fig. 3, a front elevation ofthe same. Fig. 4is a de tail vie-w 0f the device for operating the head, and Fig. 5 is adetail of the pawl which operates the looking device of the head.

A represents a lathe-bed of the ordinary and well-known form, having ahead-stock, A, and tail-stock A as usual, both of which are adjustableupon the bed in theordinary manner.

Turret-heads are usually secured in a horizontalposition upon a stock orframe which takes the place of the tail-stock, and I desire to arrangethe head upon the usual tail-stock found upon all lathes, and do this inthe following manner: I provide a small frame, B, clamped or securedupon the tail-stock by a single bolt, b, entering a hole, b, in the faceof the stock, as shown. This frame is formed with twoforwardly-projecting arms or ways, B B, upon which slides a cross-head,O, the outer ends of which clasp the ways B upon all sides, as fullyseen in Fig. 3, and thus move firmly and accurately, without anytendency to twist, and retain the dies in proper alignment with theirwork, as will be presently seen. This cross-head is secured to thespindle a of the tail-stock by means of a set-screw,

(No model.)

0, and is moved backward and forward by this spindle during theoperation of threading or screw-cutting, as hereinafter more fullydescribed. Pivoted upon a horizontal bolt or shaft, 0, of the cross-headis the turret-head D, preferably of circular form, and provided with aseries of sockets or holes, d, passing through it near its periphery, inwhich the dies are clamped by set-bolts D, passing through the sides ofthe head, as shown in the drawings. These bolts project from the head ashort distance, and are each formed with a short section, 01, free fromscrew-threads, which serve to engage a hinged arm, E, to operate thehead at proper times in its movement. This arm E is hinged upon anoffset, 0, of the frame B, below the turret, and projects forward andacross the machine a sufficient distance to engage one of the lowerscrew-pins or set-bolts, D, upon the backwardmotion of the crosshead,the hinged arm being formed with a shoulder, e, engaging the mainportion of the frame at this time, and holding it firm. while thepressure of the projecting pin is upon it. Behind the rear end of thehinged arm E is a spring-actuated pin, e, socketed into and projectingfrom the frame B, and this springpin allows the free forward motion ofthe arm during the corresponding motion of the crosshead and turret,while it at once returns the arm to position when released. The outerside of I a small arm, projects into this notch from thespring-catch G,which lies just above it. Upon the way or guide-arm B is a hinged pawl,h, the outer end of which lies against a stop pin or projection, z, ofthe way. The

' pawl is wedge-shaped on its point, as at h, and

has a short straight portion, h near its heel, for a purpose presentlyseen. The shaft h. of

this pawl passes through the way B, forming a pivot upon which the pawlturns, and is on its lower end furnished witha spring, i, toreturn IOO -after being released.

motion of the cross-head the point of the i tail-stock of a lathe,having guides B, proit to position after operation, The hand-wheel usedupon the rear end of the spindle a of the tail-stock is removed forusing the attachment, and a small rod or shaft, M, substituted, in theouter end of which is fulcrumed the operating-lever M, the end of whichis connected by a link, m, with a projection. or arm, m, clamped uponthe tail-stock,as in Fig. 1. This arm is provided with a bolt or screw,magainst which strikes a stop-lug, n, on the rod M, and serves to limitthe sliding motion of the device. I

But a minute is required to attach the device in the manner described tothe tail-stock of'a common lathe, and it is then ready for use incuttingscrew-threads, either outside-or inside dies being: clamped in thehead,.as may be desired. lathe-position shown in Fig. 1 theheadis' heldby the spring-catch, with one ofv its dies in line with the work to beoperated upomwhich is secured in the head-stock in l the turret-head 1),formed with sockets-d, the 5 set-bolts D, having a short plain portion,d,

the *usual way, The cross-head is-now pushed forward by theoperating-lever, its arms passing over the pawl h,which is turned asideand springs back to place at once. The turret head inpassingforwardduring this motion en gages and turns the outer end of the hingedarm E,which is also at once returned to place Upon the backward pawl h passesbehind the arm 9 of the springcatchand draws it back to release thehead. The set-pinFD on thelower side of the head now engagesthe inclinedarm E, and sliding along this arm turns thehead, the catch G being heldback. by the straight portion of the pawl h till ,the. head is started,and is then released, bearingagainst the head till it again falls into,

, one of: its-notches and locks the turret with the next diaeinposition. This operation is repeated tillal'l or as'many as desired, ofthe dies have: been; used, and a new piece of work is then; placedinposition: to be operated upon. It wiili thus: be seen that any one orallof the dies maybe used at will, and the turret may be: set atanypoint by simply drawing. back. the catch and turning the head by hand.

' By applying the attachment to the usual tailr-s'tock: much expense issaved, and the de maticallyturning it as-it ismoved to and fromthework,.substantially as andfor the purpose setfortm.

2. The combination, with the tail-stock of a lathe, of a guide-framesecured to the stock, a cross-head sliding thereon and secured to thespindle of the tail-stock, a turret-head pivoted upon the cross-head,socketed for the reception of the dies, and provided with screws forclamping the dies which project from the side of the turret, aspring-catch engaging notches in the turret .to hold it in position, a

sockets for receiving the dies, and provided with projecting set-screwsfor securing them, in place, in combination with an incline or I armonthe frame B, against which'the pro j ecting serewsstrike torevolve thehead, sub stantiall'y as and for the purpose set forth.

4.- Ina screw-cutting attachment forlathes,

and the cross-head G, slidingon guidesor ways to and from the work, incombinationwith the f e, and the spring=pin e, "socketed in theframe andbearing against the arm, substantially as 1 and; for the purpose setforth,

5. The frame B, removably clamped; to; the

vided with a pivoted spring-pawl, h, in combination witha cross-headsliding upon said ways, and a pivoted turret-head, I), thereon,- formedwith notches on its periphery, and the spring-catchGr, having an arm, g,engaging the pawl on the guides, substantially as and for' the purposeset forth,- I

6. In ascrew-cutting attachment for-lathes, the tail stock provided witha removable frame,-B,.having the hingedspringarmE, and the guidesB",:carrying the pivoted spring-pawl h, in combination with thecross=head -"O, at tached to the tail-spindle, the turret-head D,pivoted uponsaid cross-head, and formed with sockets d,- n'otches d,-and set-screws D, the spring-catchG,-recessed in one arm ofthe-crosshead, and provided with an arm, g, for engagement with the pawlh to release the turret, the shaft M, attached to the rear" end .of thespindle, the operating-lever M, pivoted on the end of said spindle, andthe opposite end hinged to the frame, the set-bolt n, andnstoplugn forlimiting the-motion ofthe cross-head, all constructed and arranged tooperate substantially as and for the purposeset forth.

In testimony whereof I affix my signature'in presence of two witnesses.

VVILLTAM FREGH.

Witnesses: V v

CHAS. KREssMA -N,

WM. 0. MGARTHUR;

